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WEBENCH® Tools: TINA-TI - AC analysis referenced to a different node than the source

Tool/software: WEBENCH® Design Tools

Hi, 

i want to see the transfer function from one point to another in a circuit.  I use AC analysis, and can see the TF from source to point A, and source to point B.  But i want to look at point A to point B.

Eg below i want to see the shape of this transformer, relative to a signal generator output (after 50 Ohm).  

I can add a post-processor formula OUT(s)/IN(s) which seems to work, but this doesn't work with parameter stepping (unless i want to create multiple instances every time i change a component parameter sweep). Is there a way to do this? 

I tried a controlled source with V(N1)/V(N2), but this is in time domain so doesn't work. Is there a simple way that im missing?